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22 November, 14:46

Factor 25x2 - 16.

A. (5x - 4) 2

B. (5x + 4) 2

C. (5x + 4) (5x - 4)

D. (5x + 1) (5x - 1)

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Answers (1)
  1. 22 November, 14:51
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    25x^2 - 16

    (5x - 4) 2 = 10x - 8

    (5x + 4) 2 = 10x + 8

    (5x + 4) (5x - 4) = 25x^2 - 20x + 20x - 16 = 25^2 - 16

    (5x + 1) (5x - 1) = 25x^2 - 5x + 5x - 1 = 25x^2 - 1

    Answer:

    C. (5x + 4) (5x - 4)
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